LS2 HP Questions
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Instructor
Joined: Dec 2011
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LS2 HP Questions
If one assumes standard physics - more power means more energy burned -- Assuming what I have heard is true my base 07 LS2 has o/a 400HP at the crank and probably puts about 330 to 335 to the wheels. Have been told a dyno tune can put around 399 at the wheels give or take. What does this do to gas milage - not worried about it -- just curious?
GR
GR
Racer
Joined: Sep 2007
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From: Fallsington PA
A dyno tune wont get a stock LS2 car anywhere near 399rwhp. Not sure where you heard that from. A tune can help increase fuel mileage because some of the increase in power is attributed to a leaner air fuel ratio.
Team Owner
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From: Short Hills, NJ
Thread Starter
Instructor
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Ls2 hp
See that's why I ask the question 
I was told by the tuner it would bump her up to that....I would expect to see a fairly significant change in performance characteristics: better throttle response...and a bit more power but I questioned that much of a boost.
GR
I was told by the tuner it would bump her up to that....I would expect to see a fairly significant change in performance characteristics: better throttle response...and a bit more power but I questioned that much of a boost.GR
Racer
Joined: Sep 2007
Posts: 418
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From: Fallsington PA
If a tuner told you that your stock LS2 with a tune would make 399rwhp I would look for a different tuner.
Melting Slicks
Joined: Dec 2006
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From: Woodinville WA
Your tuner reminds me of an old school hot rodder. I know a bunch of those guys who still live in the 70's; their BS is worse than the tall tales fishermen tell. One guy I knew put a Chrysler Big block with a dual carb tunnel ram (looked impressive) in a 37 Studebaker coupe with a custom 4link chassis and claimed it would run 9's. Finally took it to the track after a few years of BS and it ran a 12 
Race Director
Joined: Mar 2005
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From: Austin Texas
Don't expect a MPG increase from a tune unless you are at full throttle all the time. The way I understand it;
A tune doesn't affect the Air/Fuel ratio where you do 90% of your driving, the Computer constantly adjusts the A/F ratio to the best for emissions unless you are running full throttle. Full throttle the tuner can change A/F ratios. There are no available tuner A/F changes for part throttle running.
A tune doesn't affect the Air/Fuel ratio where you do 90% of your driving, the Computer constantly adjusts the A/F ratio to the best for emissions unless you are running full throttle. Full throttle the tuner can change A/F ratios. There are no available tuner A/F changes for part throttle running.
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From: LOS ANGELES CA.
Race Director
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From: Austin Texas
My '05 stick with just an axleback was 346RWHP on local Dynos, after a Tune w/headers/hi flow cats and a CAI it was 379RWHP.
Pretty much what everybody was getting with an honest Dyno. Some Dynos/Tuners are noted for being very optimistic about RWHP readings.
My '08 A6 was 373RWHP on local dynos, still stock.
Pretty much what everybody was getting with an honest Dyno. Some Dynos/Tuners are noted for being very optimistic about RWHP readings.
My '08 A6 was 373RWHP on local dynos, still stock.
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From: West Dundee IL
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My '05 stick with just an axleback was 346RWHP on local Dynos, after a Tune w/headers/hi flow cats and a CAI it was 379RWHP.
Pretty much what everybody was getting with an honest Dyno. Some Dynos/Tuners are noted for being very optimistic about RWHP readings.
My '08 A6 was 373RWHP on local dynos, still stock.
Pretty much what everybody was getting with an honest Dyno. Some Dynos/Tuners are noted for being very optimistic about RWHP readings.
My '08 A6 was 373RWHP on local dynos, still stock.
Instructor
Joined: Aug 2007
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From: Belton Tx
Most of you guys don't realize how your tuners tune on the dyno. "Alot" of them throw a little bit of timing in low load cruse areas and rape you PE table and add timing accordingly. Will you see an increase in WOT performance, yes... Will you see an increase in MPG highly doubtful.
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From: Austin Texas
Instructor
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From: FL
10-15hp max. Power comes from ignition timing. If your car doesn't need any more, like mine, than a tune won't add much power at all. But there are plenty of added benefits, and a good tuner can tell you many of the additional changes they can make such as the temperature in which the fans kick on, skipshift delete, torque management, etc. Depending on your A/F you could conceivably increase your fuel mileage, there are some tricks, too, for lean cruise that the factory doesn't do.
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